iosを使って画像のメタデータを表示したい。絞り、シャッタースピード、露出補正、ISO、レンズ焦点距離などのメタデータ。
22284 次
10 に答える
29
CGImageSourceRef source = CGImageSourceCreateWithURL( (CFURLRef) aUrl, NULL);
CGImageSourceRef source = CGImageSourceCreateWithData( (CFDataRef) theData, NULL);
NSDictionary* metadata = (NSDictionary *)CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(source,0,NULL));
CFRelease(source);
辞書の内容はこちらでご確認ください。
于 2012-09-18T14:13:55.267 に答える
12
画像パスからメタデータを取得するコードは次のとおりです。
NSData *imagedata = [NSData dataWithContentsOfFile:imagePath];
CGImageSourceRef source = CGImageSourceCreateWithData((CFMutableDataRef)imagedata, NULL);
NSDictionary *metadata = [(NSDictionary *)CGImageSourceCopyPropertiesAtIndex(source,0,NULL)autorelease];
または、swift 4.0 を使用している場合:
var imagedata = Data(contentsOfFile: imagePath)
var source: CGImageSourceRef = CGImageSourceCreateWithData((imagedata as? CFMutableDataRef), nil)
var metadata = CGImageSourceCopyPropertiesAtIndex(source, 0, nil) as? [AnyHashable: Any]
于 2013-11-25T06:46:15.540 に答える
0
画像サイズを取得するために使用しているものは次のとおりです。
+ (CGSize) sizeOfImage:(NSString *) fileName withPath: (NSURL *) fullDirectoryPath;
{
NSURL *imageNameWithPath = [NSURL URLWithString:fileName relativeToURL:fullDirectoryPath];
CGImageSourceRef source = CGImageSourceCreateWithURL( (CFURLRef) imageNameWithPath, NULL);
if (!source) return CGSizeZero;
CFDictionaryRef dictRef = CGImageSourceCopyPropertiesAtIndex(source,0,NULL);
NSDictionary* metadata = (__bridge NSDictionary *)dictRef;
NSLog(@"metadata= %@", metadata);
CGSize result = CGSizeZero;
CGFloat width = [metadata[@"PixelWidth"] floatValue];
CGFloat height = [metadata[@"PixelHeight"] floatValue];
NSLog(@"width= %f, height= %f", width, height);
// The orientation in the metadata does *not* map to UIImageOrientation. Rather, see: https://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CGImageProperties_Reference/index.html#//apple_ref/doc/constant_group/Individual_Image_Properties
// This idea of orientation seems a little odd to me, but it seems it translates to even numbers need to be switched in width/height, odd numbers do not.
NSUInteger orientation = [metadata[@"Orientation"] integerValue];
switch (orientation) {
// Comments give "Location of the origin of the image"
case 1: // Top, left
case 3: // Bottom, right
case 5: // Left, top
case 7: // Right, bottom
result = CGSizeMake(width, height);
break;
case 2: // Top, right
case 4: // Bottom, left
case 6: // Right, top
case 8: // Left, bottom
result = CGSizeMake(height, width);
break;
default:
NSAssert(NO, @"Should not get to here!");
break;
}
CFRelease(source);
NSLog(@"size: %@, orientation: %d", NSStringFromCGSize(result), orientation);
return result;
}
/* Example meta data:
ColorModel = RGB;
Depth = 8;
Orientation = 6;
PixelHeight = 1936;
PixelWidth = 2592;
"{Exif}" = {
ColorSpace = 1;
PixelXDimension = 2592;
PixelYDimension = 1936;
};
"{JFIF}" = {
DensityUnit = 0;
JFIFVersion = (
1,
1
);
XDensity = 1;
YDensity = 1;
};
"{TIFF}" = {
Orientation = 6;
};
}
*/
于 2014-12-10T01:53:45.413 に答える
0
私自身の質問に答えます。GPS メタデータを取得するメモリ効率が高く、高速な方法は次のとおりです。
let options = [kCGImageSourceShouldCache as String: kCFBooleanFalse]
if let data = NSData(contentsOfURL: url), imgSrc = CGImageSourceCreateWithData(data, options) {
let metadata = CGImageSourceCopyPropertiesAtIndex(imgSrc, 0, options) as Dictionary
let gpsData = metadata[kCGImagePropertyGPSDictionary] as? [String : AnyObject]
}
2番目のオプションは
if let img = CIImage(contentsOfURL: url), metadata = img.properties(),
gpsData = metadata[kCGImagePropertyGPSDictionary] as? [String : AnyObject] { … }
Swift の方が見栄えがしますが、より多くのメモリを使用します (Profiler でテスト済み)。
于 2018-02-28T11:08:15.270 に答える
-2
画像の exif メタデータを読み取るには、アセット ライブラリを使用する必要があります。
#import <AssetsLibrary/AssetsLibrary.h>
次に、次のコードを追加します。
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSURL *assetURL = [info objectForKey:UIImagePickerControllerReferenceURL];
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
__block NSMutableDictionary *imageMetadata = nil;
[library assetForURL:assetURL
resultBlock:^(ALAsset *asset) {
NSDictionary *metadata = asset.defaultRepresentation.metadata;
imageMetadata = [[NSMutableDictionary alloc] initWithDictionary:metadata];
NSLog(@"%@",imageMetadata.description);
}
failureBlock:^(NSError *error) {
}];
}
これが役立つことを願っています
于 2014-07-15T11:34:40.500 に答える